How do forests help protect Alpine communities from avalanches?

For centuries, Alpine communities have relied on mountain forests as a natural defense against avalanches. These forests protect villages, highways, and paths by acting as physical barriers that can inhibit or stop small slides.1

The effectiveness of this protection is largely due to the ability of trees to anchor the snowpack to the slope. On steep terrain, a sufficient density of conifer trees—approximately 1,000 trees per hectare—prevents the conditions necessary for slab avalanches to form. Even younger forests, aged 20 to 30 years, provide significant protection by stabilizing the snow.21

Because healthy, dense forest cover is critical for safety, land managers in the Alps actively work to maintain these areas. This includes efforts to increase the density of existing forests and introduce healthy trees into unused pastureland, ensuring that these natural barriers remain robust against the threat of sliding snow.1